Mouse Button Mapped to "Show/Hide Desktop" Causing Alerts

I have my middlemouse button programmed for hide/show desktop globally. Once per Windows session, I get an event in firewall event log if I press the middle mouse button down. I have Intellipoint set to deny and I am POSITIVE that this version of Intellipoint is not connecting to internet for updates or anything, since I have tested with several other firewalls. (Plus I don't get a popup alert if I set Intellipoint to "ask")